Oatey 39016 Sure-Vent Air Admittance Valve with 1-1/2-Inch by 2-Inch PVC Adapter, 2-Inch The product is manufactured in United states The product is highly durable and easy to use Easy installation and easy handling Complies to ANSI/ASSE 1051 A&B Adapter allows solvent welding to 1 1/2-Inch or 2-Inch Sch. 40 PVC pipe or threads into 2-Inch FIP fitting For use as a secondary vent Each valve individually tested